Patents by Inventor Johannes Petruz Zijp

Johannes Petruz Zijp has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cylinder head with valve seat and method for the production thereof
    Patent number: 9404400
    Abstract: Cylinder head made of cast iron has valve seats provided therein. The valve seats include an annular bore provided in the cast-iron material, a nickel-based intermediate layer which is provided thereon and a contact layer which is provided on said intermediate layer. The contact layer has an air-hardening tool steel, wherein said layers are provided in such a manner that an annularly acting compressive stress is present near the free surface of said contact layer. The invention further includes a method for the production thereof.
    Type: Grant
    Filed: August 3, 2009
    Date of Patent: August 2, 2016
    Assignee: DAF TRUCKS N.V.
    Inventors: Hendrik Marcel Slot, Sebastiaan Maria Krosse, Johannes Petruz Zijp
  • CYLINDER HEAD WITH VALVE SEAT AND METHOD FOR THE PRODUCTION THEREOF
    Publication number: 20110239858
    Abstract: Cylinder head made of cast iron has valve seats provided therein. The valve seats include an annular bore provided in the cast-iron material, a nickel-based intermediate layer which is provided thereon and a contact layer which is provided on said intermediate layer. The contact layer has an air-hardening tool steel, wherein said layers are provided in such a manner that an annularly acting compressive stress is present near the free surface of said contact layer. The invention further includes a method for the production thereof.
    Type: Application
    Filed: August 3, 2009
    Publication date: October 6, 2011
    Inventors: Hendrik Marcel Slot, Sebastiaan Maria Krosse, Johannes Petruz Zijp